1. Centre for Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
2. Red Bow Ranching Ltd., Calgary, AB T3C 0Y2, Canada.
3. Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD 4072, Australia.
4. Livestock Gentec, University of Alberta, Edmonton, AB T6G 2P5, Canada.
5. AgResearch, Invermay Agricultural Centre, Mosgiel 9053, New Zealand.